Add simple developer documentation.

docs/Development.md

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+# Development
+
+Mekanism is developed for Minecraft 1.6.2 using Minecraft Forge.
+
+## Prerequisites
+
+* Minecraft Forge for MC 1.6.2 <http://files.minecraftforge.net/>
+* Dev build of CodeChickenCore for MC 1.6.2 <http://www.chickenbones.craftsaddle.org/Files/New_Versions/links.php>
+* Dev build of NEI for MC 1.6.2 <http://www.chickenbones.craftsaddle.org/Files/New_Versions/links.php>
+
+## Directory Structure
+
+* /common - Source code
+    - / _other_ _mod_ _apis_
+    - /mekanism
+        - /{api,client,common} - Core Mekanism mod
+        - /generators - Generators Mod
+        - /tools - Tools Mod
+* /docs - Documentation
+* /etc - logo and mcmod.info for each package
+* /resources - Non-code assets for the core mod
+
+## Packaging structure
+
+### Mekanism.jar
+
+* /assets - From /resources/assets
+* / _other_ _mod_ _apis_ - .class files from /common/ _other_ _mod_ _apis_
+* /mekanism/{api,client,common} - .class files from /common/mekanism/{api,client,common}
+* logo.png - from /etc/core
+* mcmod.info - from /etc/core
+
+### MekanismGenerators.jar
+
+* /mekanism/generators - .class files from /common/mekanism/generators
+* logo.png - from /etc/generators
+* mcmod.info - from /etc/generators
+
+### MekanismTools.jar
+
+* /mekanism/tools - .class files from /common/mekanism/tools
+* logo.png - from /etc/tools
+* mcmod.info - from /etc/tools